Mahogany town, just south of lake of rage.
hes in the seafoam isands
face him, click on him, then have courage and believe!
beat the other 7 gyms in kanto and talk to the 8th gym leader on cinnabar island. he will leave and go back to the gym
you find him in sed foam island because his gym burned down at cinnibar island
cinnabar island need 7 kanto badges
Enter the cave and go to the first ladder climb it and you'll arrive in the gym
move to the 8th gym
Blackthorn city, in kanto you find him at cinnibar island show him your 7 kanto badges to make him go back to the gym then you can battle him.
to face the viridian gym leader Blue (Gary) you have to get the first 7 of the gym badges from the kanto region and speak to him on cinnibar island, he will return to the gym an await your challange. his Pokemon are quite strong so train hard :)
When you go to Cinnabar, if you keep on surfing until you get to the islands you will reach the cave. Go in and take the ladder going up. The gym leader Blaine is there. He uses fire type Pokemon
he is found in cinnabar island on gold, silver, and crystal versions. on soul silver and heart gold he's in his gym after u fight all 7 others before him. brock, misty, lt. surge, erika, janine, sabrina, and blane.
The leader which is Blue (Gary) is in Cinnabar Island but won't go back to Viridian until you get the other 7 Kanto Badges. The gym is in Seafoam Islands, which is East (left) of Cinnabar Island. You go up the ladder as soon as you enter.